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is a significant concern for physicians. Central# `5 U) h, `% R9 T3 S
precocious puberty (CPP), which is mediated! [" p4 i1 A+ J
through the hypothalamic pituitary gonadal axis, has1 S7 R6 [: D: L
a higher incidence of organic central nervous system
9 N8 a% \' N0 B3 P$ @, M# Flesions in boys.1,2 Virilization in boys, as manifested* ?) t2 h" D% z6 Z* l0 I# c# O
by enlargement of the penis, development of pubic
0 n D. {6 n" E% J7 ihair, and facial acne without enlargement of testi-
' n3 ^" o" R' s7 }4 Ccles, suggests peripheral or pseudopuberty.1-3 We2 p- X* }" \4 `. o8 |
report a 16-month-old boy who presented with the M6 i& P0 @5 g4 R* ?
enlargement of the phallus and pubic hair develop-: j6 ^ e3 @3 a! M) o
ment without testicular enlargement, which was due
" u% I: s/ H/ D1 \to the unintentional exposure to androgen gel used by( _0 n9 }$ d2 C6 e8 f& a9 e" U
the father. The family initially concealed this infor-7 I# o. F! `5 v4 x# e- _
mation, resulting in an extensive work-up for this- Y" X' L& J+ D2 H5 _! C
child. Given the widespread and easy availability of
; g1 d# E5 v7 [3 a: r* J8 Stestosterone gel and cream, we believe this is proba-- k, q! m& {, S/ Q/ X6 A
bly more common than the rare case report in the
! R! l8 O# e: M$ Q2 k0 @4 Dliterature.4' `3 s# D9 W# m' w" J8 } T5 p$ D
Patient Report
1 ~& [, W" Z4 p& `# {( LA 16-month-old white child was referred to the- x. j; i, `6 A1 N0 d+ Y
endocrine clinic by his pediatrician with the concern
5 r+ |7 \+ Y* e B. iof early sexual development. His mother noticed
* N0 R1 g0 ^, k1 L+ g2 O clight colored pubic hair development when he was
% m. r1 Y) m5 M, B8 o" [ nFrom the 1Division of Pediatric Endocrinology, 2University of& a* p; J2 z* x. x) _3 q
South Alabama Medical Center, Mobile, Alabama.
}) k- ?% ^5 Y% {! I4 `Address correspondence to: Samar K. Bhowmick, MD, FACE,# [6 G( O. C/ m! R& ~' P- e
Professor of Pediatrics, University of South Alabama, College of' z4 C+ ^$ e) s* e, e- l6 W
Medicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;# ^( ?& ]) j' Q/ x# N- {' y" A- f6 R
e-mail: [email protected].
8 a" R* E F5 a- f4 habout 6 to 7 months old, which progressively became
' d/ K! \4 D. m+ z" {' D/ Adarker. She was also concerned about the enlarge-# E7 d5 z1 [ J9 b
ment of his penis and frequent erections. The child
4 Y2 w9 ~2 ] n2 |+ _0 ywas the product of a full-term normal delivery, with/ \, L8 Z6 h! t0 _* L
a birth weight of 7 lb 14 oz, and birth length of- ?& I. W7 j6 W3 o! G$ ~
20 inches. He was breast-fed throughout the first year' U7 p; I' T1 d! R# K* T7 f
of life and was still receiving breast milk along with
+ v" j$ ^) a, xsolid food. He had no hospitalizations or surgery,0 ?& S' k$ B+ A% f
and his psychosocial and psychomotor development. k4 m" D( L1 z6 y- @/ v2 a
was age appropriate.
; u( r3 u" ?0 J5 r3 o, L3 IThe family history was remarkable for the father,% p: z* L( K" E$ R& p
who was diagnosed with hypothyroidism at age 16,
# y: k! `2 S: x/ S M$ b3 ~which was treated with thyroxine. The father’s$ ^7 m$ k) R1 x; d* b. m9 a1 t: z
height was 6 feet, and he went through a somewhat
7 N e# e% x( h8 u3 aearly puberty and had stopped growing by age 14.
& o& @0 I& K5 R1 m" G, PThe father denied taking any other medication. The
% ^' _1 }; I, @, p: u. _, o# f, v1 tchild’s mother was in good health. Her menarche
5 x% |' h! P2 s3 s1 d0 ^' H7 O9 A, }2 hwas at 11 years of age, and her height was at 5 feet! N6 m7 U1 R6 {( n: o5 s/ L
5 inches. There was no other family history of pre-
o; S! G& r$ X' t0 K) t9 D) @cocious sexual development in the first-degree rela-, d+ ]0 S9 T6 T
tives. There were no siblings.. S* q: l9 U* f) N% E& ?$ f4 R
Physical Examination
' x3 F, a; V; h9 cThe physical examination revealed a very active,
; B# |- @$ k- U* G" w8 Lplayful, and healthy boy. The vital signs documented
7 V9 V+ e) P# s* z6 w% oa blood pressure of 85/50 mm Hg, his length was$ Z9 A( E4 o, d/ ?$ P7 n
90 cm (>97th percentile), and his weight was 14.4 kg
6 z0 Z7 r, V* l5 k- p. n! _6 Q2 _* ](also >97th percentile). The observed yearly growth7 K; y% [2 v1 r: f! R- S% A
velocity was 30 cm (12 inches). The examination of
; C6 m# z" J8 ]1 sthe neck revealed no thyroid enlargement.' Q1 s! p3 t8 y/ E
The genitourinary examination was remarkable for# U n) x; h U8 z, [
enlargement of the penis, with a stretched length of
6 t1 J! D6 W2 V' ^8 cm and a width of 2 cm. The glans penis was very well
% V9 m, ?; P. u* g' {developed. The pubic hair was Tanner II, mostly around4 T U) [/ i- y0 N+ r
540+ N! o# z1 X4 Z" v
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
$ i- ?) }) | o" S! o1 S. u9 Cthe base of the phallus and was dark and curled. The: {6 W( S) W/ D9 s5 a) O' P5 b
testicular volume was prepubertal at 2 mL each.
^) {: n! X9 k' ^The skin was moist and smooth and somewhat! t C) _) ~) |" V5 [% q7 E: ~
oily. No axillary hair was noted. There were no9 _: D7 U6 }, p" }- K/ f+ G( e
abnormal skin pigmentations or café-au-lait spots.$ G1 X. B+ `% |
Neurologic evaluation showed deep tendon reflex 2+8 z& k! V1 N7 \: I8 X7 `! U$ x
bilateral and symmetrical. There was no suggestion
. E, E3 O7 R" Tof papilledema.
* E8 P# u7 M$ k# ULaboratory Evaluation D+ c# N- H- }& |4 v% W/ h
The bone age was consistent with 28 months by
; i9 ?- k/ _( ^5 t" K. V) ^$ t. ^using the standard of Greulich and Pyle at a chrono-
/ z2 L" D; U n; {logic age of 16 months (advanced).5 Chromosomal# ?! S5 j- V2 d; t4 o: T1 y$ | s1 h& A7 [
karyotype was 46XY. The thyroid function test
) q: Q# h( t4 Q6 ~% `* k9 Gshowed a free T4 of 1.69 ng/dL, and thyroid stimu-
" H' U2 G' |. S" clating hormone level was 1.3 µIU/mL (both normal).
# @+ r8 O3 W+ Y. S g5 fThe concentrations of serum electrolytes, blood
/ C6 d# k/ |5 ^+ J. U+ p7 purea nitrogen, creatinine, and calcium all were
" _8 a4 t7 E jwithin normal range for his age. The concentration
3 f; X) B) q, w3 V3 G5 j9 b' H' G7 hof serum 17-hydroxyprogesterone was 16 ng/dL+ c4 _- f- B0 g) S3 g2 N
(normal, 3 to 90 ng/dL), androstenedione was 20# |5 j+ f* r* d( A* }7 X. w
ng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-
2 X% x' y9 b" d1 j9 T( Pterone was 38 ng/dL (normal, 50 to 760 ng/dL)," m: D3 h# _# @5 L$ D0 D
desoxycorticosterone was 4.3 ng/dL (normal, 7 to
% ^/ l6 Y a# d1 y4 R49ng/dL), 11-desoxycortisol (specific compound S)
" r2 c4 ?; E! v( g+ @was 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-
8 d" N% Y8 [- [: l; f* Y; Utisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total; A7 ~1 F1 E1 a/ H! l3 x7 T
testosterone was 60 ng/dL (normal <3 to 10 ng/dL),, }/ L# P. ]; Q3 f L
and β-human chorionic gonadotropin was less than% l( z5 W4 Y `
5 mIU/mL (normal <5 mIU/mL). Serum follicular# e( ~* j- ~: l" W w7 Z
stimulating hormone and leuteinizing hormone; D; o: u* Z) j a4 [, t- A
concentrations were less than 0.05 mIU/mL# d. m" L: W: l- L1 D
(prepubertal).1 C& C) L, b5 m- C6 ]! l
The parents were notified about the laboratory* g) j: }; e1 `6 W! ?' B% e- O8 g; h
results and were informed that all of the tests were
; ~+ E" G6 |8 g& cnormal except the testosterone level was high. The8 ]- Y2 X' a1 p5 k) h/ W
follow-up visit was arranged within a few weeks to9 k7 H* ^5 i+ j) ^
obtain testicular and abdominal sonograms; how-
8 Z4 P0 ~0 y. @7 jever, the family did not return for 4 months.
1 B& e4 p2 X2 g5 c. g: lPhysical examination at this time revealed that the
- N" X# x( U7 {- V; w. c$ ochild had grown 2.5 cm in 4 months and had gained& A4 \" w) q8 S9 P0 @4 T, d! I& L
2 kg of weight. Physical examination remained
8 y. Q/ ~8 h4 X+ N2 hunchanged. Surprisingly, the pubic hair almost com-
3 X0 R' y& J4 h3 qpletely disappeared except for a few vellous hairs at
0 j% `% ~4 O8 Y4 qthe base of the phallus. Testicular volume was still 2& M$ `9 k) \5 w& U4 N# \
mL, and the size of the penis remained unchanged.( ]0 k2 D4 y! D; a3 j' v
The mother also said that the boy was no longer hav-
1 | a+ w' ~ ~ing frequent erections.# T/ { p1 @1 J
Both parents were again questioned about use of
+ i$ ~: ~. j yany ointment/creams that they may have applied to7 F" Q" T5 q( |: P6 A
the child’s skin. This time the father admitted the
: Y/ Q0 ] @* ETopical Testosterone Exposure / Bhowmick et al 5417 U; L% C2 E9 q8 D( X4 k! \, M
use of testosterone gel twice daily that he was apply-: L3 [3 u0 t) L! o8 D5 j2 E* t
ing over his own shoulders, chest, and back area for
" G- D8 w& Q* ?a year. The father also revealed he was embarrassed
a3 @5 S4 T+ R/ L0 Bto disclose that he was using a testosterone gel pre-
5 X5 X! }1 W- C2 P/ ^scribed by his family physician for decreased libido
) n* J% ~5 A% L3 S' ksecondary to depression.. t( A/ k) W& {1 F
The child slept in the same bed with parents.( W4 h3 l# l9 u0 V
The father would hug the baby and hold him on his3 f* U3 N: \2 S
chest for a considerable period of time, causing sig-+ R C! |$ w( u9 H/ }1 y
nificant bare skin contact between baby and father.
\( ^& I; K( qThe father also admitted that after the phone call,6 R/ `. Y7 F) n
when he learned the testosterone level in the baby
4 w" a* {/ d: E2 Wwas high, he then read the product information/ @" Y9 N$ x5 N5 D5 ~
packet and concluded that it was most likely the rea-/ V6 @$ y/ T' [1 ?2 N6 h8 @
son for the child’s virilization. At that time, they, x; t7 [% r2 o R* M" h0 s
decided to put the baby in a separate bed, and the* Z$ `$ j c/ b3 ^. O
father was not hugging him with bare skin and had
# \1 |6 J4 ?: Y( y; S. hbeen using protective clothing. A repeat testosterone" G, p! S! h0 T0 k
test was ordered, but the family did not go to the
( J3 j5 ]9 X0 f5 F# K3 q& Q/ ylaboratory to obtain the test.# [( B( e1 F7 K2 A
Discussion
' d p8 w0 h$ r% H6 Q7 u0 cPrecocious puberty in boys is defined as secondary' f% f2 h* V! D {7 U+ O/ ?
sexual development before 9 years of age.1,4
c# b! v( H2 o* F6 L/ XPrecocious puberty is termed as central (true) when' d& s* ?; j% J( t+ T) s) s
it is caused by the premature activation of hypo-
0 N- F* J' Z9 W Bthalamic pituitary gonadal axis. CPP is more com-. e5 w: r! i- }" c) H: G. a: H0 M3 x
mon in girls than in boys.1,3 Most boys with CPP* n' _% X: S; d; w& K% I
may have a central nervous system lesion that is
0 j7 ~) B$ z4 Oresponsible for the early activation of the hypothal-
1 z# A) G5 C' M* Mamic pituitary gonadal axis.1-3 Thus, greater empha-
3 X. Y8 n9 R* ~; m( o) _sis has been given to neuroradiologic imaging in R4 m3 W" T- d) k: `
boys with precocious puberty. In addition to viril-( n1 h+ z, C v8 X3 \
ization, the clinical hallmark of CPP is the symmet-
6 y5 S0 a0 r$ x& r9 U; ]: crical testicular growth secondary to stimulation by
: O2 M3 v+ F8 x) l% `# dgonadotropins.1,3
/ U3 W# o, U$ D0 W5 N. oGonadotropin-independent peripheral preco-
; n. J/ l5 c. R+ y1 Kcious puberty in boys also results from inappropriate1 _+ |5 T3 _4 X3 f8 C+ [
androgenic stimulation from either endogenous or3 J6 O, u2 j/ e' t6 ]$ o
exogenous sources, nonpituitary gonadotropin stim-
* T* [) ?9 q' U' D, iulation, and rare activating mutations.3 Virilizing; p* ]8 W% o% G: C- V1 v. C
congenital adrenal hyperplasia producing excessive
' p+ G& |! b" x' B* p2 [adrenal androgens is a common cause of precocious" o' T$ \. \5 j4 z- F% D
puberty in boys.3,45 O" G$ ~0 z. C- Y
The most common form of congenital adrenal
" X- Q. D* R4 ^1 X& X+ Uhyperplasia is the 21-hydroxylase enzyme deficiency.: T% ^9 g& m0 i: b: G& L, i* W
The 11-β hydroxylase deficiency may also result in
; x' s! t! Y0 C# C' rexcessive adrenal androgen production, and rarely,4 W2 L' ]) u% E- @
an adrenal tumor may also cause adrenal androgen
/ N) H5 \4 G k2 e) }7 \7 Mexcess.1,37 ]- V" @) ~2 X% {& `: x
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
7 N! {6 n- _4 ^0 Z c# {7 q542 Clinical Pediatrics / Vol. 46, No. 6, July 2007
/ q& e' c( y' M. a, A2 D3 `* UA unique entity of male-limited gonadotropin-
* D5 x. |$ u/ D9 xindependent precocious puberty, which is also known
; c4 C( l7 w# }as testotoxicosis, may cause precocious puberty at a
2 d# J3 R# j2 v3 t9 D( z7 ]8 P" uvery young age. The physical findings in these boys
% l) e% J. Z v0 K; {; ?with this disorder are full pubertal development,& _( V! A8 |" R% L9 ^, ]; l
including bilateral testicular growth, similar to boys
' P/ ~, B6 i% q5 c* Q% Gwith CPP. The gonadotropin levels in this disorder
5 i; l/ T# A' L. Iare suppressed to prepubertal levels and do not show
" P" v/ ^# ~$ ^& {3 wpubertal response of gonadotropin after gonadotropin-3 D) X% D7 l7 C" E( e# m8 u
releasing hormone stimulation. This is a sex-linked
3 A; X+ D! _. q. i- p1 Gautosomal dominant disorder that affects only
* d X' m8 U3 G9 H* |! f4 dmales; therefore, other male members of the family; t7 V+ S" e8 y0 C: R
may have similar precocious puberty.3
# ]) F* R5 N7 x# X0 ~' NIn our patient, physical examination was incon- }# {8 R: y$ _) k* S. [" e( ]0 L
sistent with true precocious puberty since his testi-1 `8 K3 x- H5 s" p+ X; R1 s: D' v
cles were prepubertal in size. However, testotoxicosis1 A! ~2 s( n, O! {
was in the differential diagnosis because his father
/ {# V$ }% Y6 I$ Mstarted puberty somewhat early, and occasionally,. b' U& W" z( g# F( |
testicular enlargement is not that evident in the
+ U. E# l3 f2 _+ O+ dbeginning of this process.1 In the absence of a neg-
7 k+ J2 z/ ?( dative initial history of androgen exposure, our) Y2 L1 G) A! s1 E" ]5 m
biggest concern was virilizing adrenal hyperplasia,
7 ?9 e9 W8 y) s8 @% l- D/ X+ c6 l$ Keither 21-hydroxylase deficiency or 11-β hydroxylase
5 F% V# `; ]8 U9 S( u) `deficiency. Those diagnoses were excluded by find-
6 f/ D) n7 V1 G& king the normal level of adrenal steroids.- W ^) J! z. D" I, U0 u' \
The diagnosis of exogenous androgens was strongly
$ i" D7 y/ H' H# k6 I. v, _5 T3 ysuspected in a follow-up visit after 4 months because
2 S" u/ d: s* O2 V# L* \4 s/ ithe physical examination revealed the complete disap-
/ b$ w8 v' G8 s) |# _pearance of pubic hair, normal growth velocity, and
5 w9 L' l6 v( ?: Gdecreased erections. The father admitted using a testos-' N- e1 K8 r! L" ] C, I; \
terone gel, which he concealed at first visit. He was/ Q3 u C0 U. Z2 f
using it rather frequently, twice a day. The Physicians’9 n" ]" f. G/ j7 J. \7 C9 F8 q# l
Desk Reference, or package insert of this product, gel or2 O0 K; |. M, h6 y) p
cream, cautions about dermal testosterone transfer to# } z- b, J4 p) h. L" A9 e6 i' p
unprotected females through direct skin exposure.1 s% y. t( x' w% i
Serum testosterone level was found to be 2 times the
* |2 c+ z. J2 M2 _; J( C7 bbaseline value in those females who were exposed to
. ^& d# S8 h f6 F9 Veven 15 minutes of direct skin contact with their male7 D2 y) V3 ]& W9 X3 ~6 L6 M" V
partners.6 However, when a shirt covered the applica-
7 D6 q& e6 V% C) ation site, this testosterone transfer was prevented.
6 c' d- I$ o X6 \Our patient’s testosterone level was 60 ng/mL,
- L( z. b+ Q# O8 e* ~' X: iwhich was clearly high. Some studies suggest that
- H) c. x' n7 R" [4 vdermal conversion of testosterone to dihydrotestos-! C% K. u: L3 Z( p; a: k
terone, which is a more potent metabolite, is more7 I8 L. d, n) B( Q
active in young children exposed to testosterone
1 \1 j1 S0 ]' J4 _exogenously7; however, we did not measure a dihy-, H# @- \/ b4 C- M$ Z- Q9 g8 | m9 z
drotestosterone level in our patient. In addition to0 c; L3 }# K# e% \/ D8 U
virilization, exposure to exogenous testosterone in
) `. K9 l' k+ q7 j) Zchildren results in an increase in growth velocity and" s# k0 R2 w4 p- X
advanced bone age, as seen in our patient.; ]" D* p. G8 |, F
The long-term effect of androgen exposure during
& k4 o) J A4 x; u, R9 _, F* Jearly childhood on pubertal development and final
1 k% Y' Y( y1 E( Yadult height are not fully known and always remain
$ I( C! _% C: [6 N* ?2 Ia concern. Children treated with short-term testos-
W U" A7 x" n9 ^3 E' Oterone injection or topical androgen may exhibit some
2 _ c- v; I; }2 D* \0 \. eacceleration of the skeletal maturation; however, after
* f8 G# x2 @: j' Scessation of treatment, the rate of bone maturation* U& |. Y3 i9 q
decelerates and gradually returns to normal.8,9, `& p2 U: C: ?# m- N/ }
There are conflicting reports and controversy
0 R0 I9 |8 G) U. Pover the effect of early androgen exposure on adult
+ m) ]) q6 e0 W" h h' zpenile length.10,11 Some reports suggest subnormal
+ Y, h) A+ e4 s% N/ n) qadult penile length, apparently because of downreg-8 b4 `7 ?5 \3 X
ulation of androgen receptor number.10,12 However,
?) p$ n# v: n1 c: h- K$ NSutherland et al13 did not find a correlation between
# a C( `2 ~( Y. F) s5 J3 Mchildhood testosterone exposure and reduced adult4 X& @5 `6 p8 @2 x- w4 L
penile length in clinical studies.8 K% {4 \ I% k$ {
Nonetheless, we do not believe our patient is
! E1 y# [; Q, ?( Fgoing to experience any of the untoward effects from
' p! j0 z/ O: Utestosterone exposure as mentioned earlier because
8 r, u0 X4 }7 u( V7 othe exposure was not for a prolonged period of time.% f( M% l4 ]1 [" Z- j4 t4 e3 o
Although the bone age was advanced at the time of
/ |6 s) ^( T; ^3 F' S% ~% D+ | P/ Ediagnosis, the child had a normal growth velocity at. q0 E2 G3 i& [8 g' S
the follow-up visit. It is hoped that his final adult# B! N! E( `; ?
height will not be affected.
& i5 N# `! P7 [: s, x7 oAlthough rarely reported, the widespread avail-) E! j- l7 z* ?5 r
ability of androgen products in our society may6 V* P+ o) ]% }& X
indeed cause more virilization in male or female
- i& t8 V" a& g5 Echildren than one would realize. Exposure to andro-$ h3 B: f: x" n3 `
gen products must be considered and specific ques-
5 N& s; k* q9 Y1 {' M: Htioning about the use of a testosterone product or
: ]! g! {& v% c$ U" ]" ~gel should be asked of the family members during2 M, N2 J/ F0 a) a
the evaluation of any children who present with vir-
2 N7 f: U$ h# r6 y4 `9 r$ u% Cilization or peripheral precocious puberty. The diag-: @' q( \$ t! h9 _# R' U
nosis can be established by just a few tests and by9 r$ L: s3 m/ ?* Q
appropriate history. The inability to obtain such a6 n, U& b6 Z9 i" G& G
history, or failure to ask the specific questions, may
- o' h1 M8 t1 f* jresult in extensive, unnecessary, and expensive
1 V- q" e$ f' N" Finvestigation. The primary care physician should be. j; ]1 j% b7 y2 ?# g
aware of this fact, because most of these children! T {, a+ c5 S
may initially present in their practice. The Physicians’8 k3 s- S" o; Z7 G
Desk Reference and package insert should also put a
: i- a: O, N. Kwarning about the virilizing effect on a male or
?) \2 g' _+ F7 p( o# [1 Mfemale child who might come in contact with some-
9 w2 ]# ~/ M( v, _one using any of these products.' d7 w E& z8 D# ~" F; t
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2. Rivarola M, Belgorosky A, Mendilaharzu H, et al. Precocious
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9 O. V, N- Z) p2 L+ Oexposure to testosterone. Pediatrics. 1999;104:e23.
# @9 a2 v4 K1 ^0 v; |5. Greulich WW, Pyle SI, eds. Radiographic Atlas of* ~- o3 [8 o3 ]1 I
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Economics Company, Inc; 2004:3239-3241.
+ T c0 O; ?5 Y! o7. Klugo RC, Cerny JC. Response of micropenis to topical; x9 ~7 v$ x7 y" {3 M/ d7 `# z8 l
testosterone and gonadotropin. J Urol. 1978;119:
s" F0 s& P. J" X: z5 L667-668.8 ?) X) H1 k* p5 i& ^7 D) v+ W* _
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