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is a significant concern for physicians. Central
& i) b( }% z( I5 d8 oprecocious puberty (CPP), which is mediated
6 }9 j. t% \8 Y2 ithrough the hypothalamic pituitary gonadal axis, has/ b7 P/ J& w7 W0 G; M
a higher incidence of organic central nervous system" K" F$ s$ M3 S* ?
lesions in boys.1,2 Virilization in boys, as manifested% J$ v: I2 h8 o) x
by enlargement of the penis, development of pubic
3 e% B4 B+ h" _8 thair, and facial acne without enlargement of testi-
1 u+ \6 C7 k, [cles, suggests peripheral or pseudopuberty.1-3 We
- Q' [( q/ t. c6 S% ^& D- o- }report a 16-month-old boy who presented with the: P: J2 Y3 b& ~3 j _' Q
enlargement of the phallus and pubic hair develop-
$ z# g$ R- k* n, E1 tment without testicular enlargement, which was due
% D& @% u( E! a4 E. Qto the unintentional exposure to androgen gel used by
/ X4 }, W( f$ M# j3 xthe father. The family initially concealed this infor-
( z" ~+ X+ p6 v( o x& T# L: ]: {mation, resulting in an extensive work-up for this
$ u* ?, t2 I6 X, Fchild. Given the widespread and easy availability of b/ g5 u/ n0 l/ N* J7 p) T
testosterone gel and cream, we believe this is proba-
7 a- n4 C: q. A$ q2 ybly more common than the rare case report in the
0 d" K \ S! ]1 Aliterature.4
4 M' p @, D% IPatient Report; I. Q5 [, m4 l% s( e8 R
A 16-month-old white child was referred to the
6 Y7 {4 L9 T L1 `* uendocrine clinic by his pediatrician with the concern
9 ~& d, S3 z3 S% H: _ ]of early sexual development. His mother noticed' W7 q- [0 k X0 c5 V( o* O
light colored pubic hair development when he was
1 h: m, e- o9 A$ R. ]From the 1Division of Pediatric Endocrinology, 2University of) m; y7 s! s! R( d; c! X/ @9 w
South Alabama Medical Center, Mobile, Alabama.
9 S& W6 N* q2 @' y) }# uAddress correspondence to: Samar K. Bhowmick, MD, FACE,
. b% s* _" D' L: |" ~Professor of Pediatrics, University of South Alabama, College of
+ [+ Y1 O! _( X: p5 U; p7 R3 ^Medicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;
8 v) G& L) D6 i/ M; ?* u4 p4 F' I4 I3 }e-mail: [email protected].
& A3 P$ @* v$ n T; z) Pabout 6 to 7 months old, which progressively became
# k# \2 b0 [* ^/ t* f7 ^# q8 }0 q* Edarker. She was also concerned about the enlarge-
8 M% _9 T9 `4 K1 b- s$ [1 b$ ]ment of his penis and frequent erections. The child
+ s8 @" R* r: N) I. _# Cwas the product of a full-term normal delivery, with
- k% g+ S7 q+ ~' k. \; o6 h+ I/ _a birth weight of 7 lb 14 oz, and birth length of
" a" B! l/ X- t- y. L20 inches. He was breast-fed throughout the first year
9 V$ K" b! J9 _+ P* Jof life and was still receiving breast milk along with
7 {1 R1 U. N5 m: U+ bsolid food. He had no hospitalizations or surgery,# ~- ?( b) ^: P& }6 B$ q
and his psychosocial and psychomotor development
2 M1 Y( c' z( r. O! x1 ewas age appropriate.
8 a \1 R3 p& ]* Z9 mThe family history was remarkable for the father,! f& o* C) i5 j% {+ U
who was diagnosed with hypothyroidism at age 16,
4 R: J) A; e( i. F$ R t7 ?which was treated with thyroxine. The father’s
0 X4 U4 A+ C2 Z! z! K7 rheight was 6 feet, and he went through a somewhat
1 s8 a+ l& n4 x$ gearly puberty and had stopped growing by age 14.
1 E6 r1 X/ z v% I9 LThe father denied taking any other medication. The
, L5 d2 n6 x9 m$ schild’s mother was in good health. Her menarche
& D V \% [6 Y- R3 _was at 11 years of age, and her height was at 5 feet
; ~# o) d! |) o: @! F5 inches. There was no other family history of pre- Z; r; c1 S6 F/ e# w2 u
cocious sexual development in the first-degree rela-! e) Y: A# E. \. S' ^' s( B$ d
tives. There were no siblings.
- }/ A1 T6 i8 O2 O4 PPhysical Examination
" @% K: k+ n0 x ?% DThe physical examination revealed a very active,
0 E# B/ m7 W- Q8 o' Z# vplayful, and healthy boy. The vital signs documented$ W# i! u, g6 ~; N; R& O1 B
a blood pressure of 85/50 mm Hg, his length was
/ Q% b' ?( F) ?& F( M90 cm (>97th percentile), and his weight was 14.4 kg, V& K& g. O, K; r k/ E9 o# E
(also >97th percentile). The observed yearly growth, L8 M! B3 u( a0 N
velocity was 30 cm (12 inches). The examination of
8 Q) d9 T. X8 t) Wthe neck revealed no thyroid enlargement.
( k8 i, H9 M4 jThe genitourinary examination was remarkable for
) B% p# K& N. Oenlargement of the penis, with a stretched length of% I$ p! S$ q+ L9 }1 J5 t6 G
8 cm and a width of 2 cm. The glans penis was very well( b+ y) j, }. D0 P# x
developed. The pubic hair was Tanner II, mostly around
7 j$ {$ ?( L0 y! s4 j/ x8 X5402 q4 P% t$ D9 B1 v! P1 Z6 z
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
- U. Z5 k) F. T8 a1 t1 hthe base of the phallus and was dark and curled. The% v. B& U# U" l4 J4 a+ S
testicular volume was prepubertal at 2 mL each.8 `& r9 n P9 w/ Z2 @
The skin was moist and smooth and somewhat
& e- w- k* w i5 M1 N2 ~" roily. No axillary hair was noted. There were no
* }. m! i+ E, z3 r- K# h7 vabnormal skin pigmentations or café-au-lait spots.
, m! e. p, S' d, U! d$ K1 n7 v9 tNeurologic evaluation showed deep tendon reflex 2+0 ]2 {/ |! _% I3 M( m0 O
bilateral and symmetrical. There was no suggestion, k% h* N$ ^* k0 X
of papilledema.
# U; A* G, L6 ^) e7 ~6 v. DLaboratory Evaluation) W7 z' O* {( Y* W" K# E
The bone age was consistent with 28 months by2 b6 S8 S$ _- y' q; `6 |
using the standard of Greulich and Pyle at a chrono-% r _7 U& Q1 h! T J
logic age of 16 months (advanced).5 Chromosomal
7 U% L2 z3 c a5 O0 S& q' qkaryotype was 46XY. The thyroid function test5 x5 v' U P/ W" n$ i; z
showed a free T4 of 1.69 ng/dL, and thyroid stimu-/ `; F) m1 {' {
lating hormone level was 1.3 µIU/mL (both normal).
' Z! B/ l1 r! Z* u0 p W& OThe concentrations of serum electrolytes, blood' O; e* G8 m7 a1 G
urea nitrogen, creatinine, and calcium all were8 e# f+ `5 I, d: b: A3 G. S
within normal range for his age. The concentration
" E6 S; e9 C3 v" Pof serum 17-hydroxyprogesterone was 16 ng/dL
" l3 J1 H. f' Y- f N F+ b(normal, 3 to 90 ng/dL), androstenedione was 20
) y K2 c! x# ^ng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-% O0 J" t' p- L( V
terone was 38 ng/dL (normal, 50 to 760 ng/dL),
" H5 B' m5 ~6 Ldesoxycorticosterone was 4.3 ng/dL (normal, 7 to
6 L& p1 M: d1 G- S* x- g$ n2 v49ng/dL), 11-desoxycortisol (specific compound S), r8 t* U3 u$ ^0 N, s$ ~
was 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-3 S9 K/ k( D3 X3 O
tisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total+ L g. r# b$ Z( f" B8 D
testosterone was 60 ng/dL (normal <3 to 10 ng/dL),7 F% y- S# D9 T& `! H* [
and β-human chorionic gonadotropin was less than: X6 z5 l6 ~* A# ?
5 mIU/mL (normal <5 mIU/mL). Serum follicular4 e+ @$ Q: `2 l+ M- G- e
stimulating hormone and leuteinizing hormone
+ S) ?# u' y2 T& T2 @: r2 Econcentrations were less than 0.05 mIU/mL
' K. Y/ P) v4 s% Q' Q! e; t8 k/ i(prepubertal).
\6 p3 p; m8 [9 q7 z/ {; kThe parents were notified about the laboratory
) A. I) h( N$ e9 }" [# H3 ?results and were informed that all of the tests were5 d% h$ D y- g# }: I! W4 E
normal except the testosterone level was high. The
8 E3 W2 M) j1 ^8 Y/ N! l) M2 F4 A9 efollow-up visit was arranged within a few weeks to
% U# s: G. L; }obtain testicular and abdominal sonograms; how-: @* m. ]5 O6 g n( k R$ K
ever, the family did not return for 4 months.
0 ]5 |- o! h4 A' F" CPhysical examination at this time revealed that the3 }# L5 R* F9 N
child had grown 2.5 cm in 4 months and had gained
7 ?% n# m! v1 y. x2 kg of weight. Physical examination remained
& Z4 P0 [" Q% d; h$ r3 [+ runchanged. Surprisingly, the pubic hair almost com-
+ z# P0 O, H4 Y1 t/ f- p/ h. fpletely disappeared except for a few vellous hairs at% u5 m8 [0 J+ H+ T: U, t
the base of the phallus. Testicular volume was still 2& A3 U2 j) p! I, [! M! z& B
mL, and the size of the penis remained unchanged.) Q0 ^" }5 i. j" N: D
The mother also said that the boy was no longer hav-
/ F8 o+ G4 Q% p: D- b8 ying frequent erections.
4 v8 Y+ Y- y+ j5 @6 p& z+ PBoth parents were again questioned about use of9 ~6 J2 G8 {) `- a) R2 w
any ointment/creams that they may have applied to
9 P, o7 T' e# T3 F- w; d7 zthe child’s skin. This time the father admitted the
6 |; ~' l4 D4 T8 l) @( \$ e! X. q% XTopical Testosterone Exposure / Bhowmick et al 541
- f! `6 s2 o8 l% h* puse of testosterone gel twice daily that he was apply-) U6 K2 U( Z. B" Y$ F' W
ing over his own shoulders, chest, and back area for
2 D4 s' c$ q% @+ N$ ea year. The father also revealed he was embarrassed- C( j$ \% K# j. |2 b. E1 h
to disclose that he was using a testosterone gel pre-
8 Y" V6 ~: Z* v- S$ Q1 Escribed by his family physician for decreased libido
t4 K7 F: ]) xsecondary to depression.5 V: w1 `4 u. Y+ M$ k5 ~1 I
The child slept in the same bed with parents.
+ e L$ C3 z) p1 g( ?The father would hug the baby and hold him on his
9 Z0 _8 a$ C- K' h0 Ochest for a considerable period of time, causing sig-
9 i! O, S% O0 x8 hnificant bare skin contact between baby and father.
. k. t) h' s' T' LThe father also admitted that after the phone call,
) M: {/ `9 g* Y4 C' |8 Vwhen he learned the testosterone level in the baby% D3 ]) T* N/ ?/ ?
was high, he then read the product information$ x7 Q! G( H1 u& o3 x
packet and concluded that it was most likely the rea-6 B! B2 P( j9 E- ]
son for the child’s virilization. At that time, they
" ?3 Z6 i& @4 D- kdecided to put the baby in a separate bed, and the
" k, C" [- E: G4 ~* jfather was not hugging him with bare skin and had
: f0 { j7 v6 rbeen using protective clothing. A repeat testosterone# W3 T) J! H* A1 z# p( k; J. Z
test was ordered, but the family did not go to the5 v% H$ b1 g) o4 _9 y
laboratory to obtain the test.5 s4 p- a$ C; Q- Z- Q
Discussion1 S/ a( w% F8 S5 t, Z
Precocious puberty in boys is defined as secondary
2 _/ T' }' e/ x+ s: jsexual development before 9 years of age.1,4
/ [% Z1 N4 V: P5 y6 R8 xPrecocious puberty is termed as central (true) when
/ Z2 [2 q5 r2 Y$ nit is caused by the premature activation of hypo-* L) T# k" O( g( P" ~8 A
thalamic pituitary gonadal axis. CPP is more com-8 H$ p, m3 r: O' _' X
mon in girls than in boys.1,3 Most boys with CPP
0 Q) A; q; R/ Y( X1 Z9 r* u9 q3 T- tmay have a central nervous system lesion that is m0 [: m3 T! |( s3 ]6 ?
responsible for the early activation of the hypothal-$ k4 i" R6 ` h6 Z: N8 N" R: k
amic pituitary gonadal axis.1-3 Thus, greater empha-
+ C( k& d, h1 [4 Gsis has been given to neuroradiologic imaging in
9 b) p5 f5 A4 F% X, z# g" H8 zboys with precocious puberty. In addition to viril-
8 I6 ]# T2 D+ a a: Sization, the clinical hallmark of CPP is the symmet-
" }2 E" K- B& o" X* z" Trical testicular growth secondary to stimulation by
% ?. d7 u; J# o' K* h9 _ X% v7 I& F2 ]gonadotropins.1,3
! B2 j8 E4 H* R5 YGonadotropin-independent peripheral preco-
. v; z$ f) k/ g( s% dcious puberty in boys also results from inappropriate6 _/ j4 a! x6 E. D; m o+ O
androgenic stimulation from either endogenous or
# r( T4 F8 S- I% H; J3 }exogenous sources, nonpituitary gonadotropin stim-
) U2 j6 Q/ e) r! bulation, and rare activating mutations.3 Virilizing; Q1 P" Q- L6 G% ?% R3 J9 ]
congenital adrenal hyperplasia producing excessive9 P- E, c( n9 O% d5 Z
adrenal androgens is a common cause of precocious( a& y' j X- L) X$ e' B- b
puberty in boys.3,4
, ~7 f+ P+ |1 R- r4 c( ]7 yThe most common form of congenital adrenal! G4 o+ t2 E4 B0 W) M
hyperplasia is the 21-hydroxylase enzyme deficiency.
$ _& V, y3 c9 O m, t. s8 Q" ZThe 11-β hydroxylase deficiency may also result in
! y; g' r. V# L' g" R# {excessive adrenal androgen production, and rarely,$ k3 j- z/ l% o- y8 G1 k% e
an adrenal tumor may also cause adrenal androgen! \% R0 v0 ^& u# Q4 m
excess.1,3
) h/ `5 @3 x# I, c' iat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from5 t: m% S. h( w, @/ o
542 Clinical Pediatrics / Vol. 46, No. 6, July 2007- B9 E+ g2 H+ U& v
A unique entity of male-limited gonadotropin-; u& j# A7 o8 C" {5 n+ e
independent precocious puberty, which is also known
2 y' |) C$ Q% M, `/ bas testotoxicosis, may cause precocious puberty at a8 F$ I* I5 M5 t
very young age. The physical findings in these boys
* ~- p5 L8 C& X3 z: twith this disorder are full pubertal development,, |8 M, k8 r! v4 c1 g% Q) N
including bilateral testicular growth, similar to boys* _! `! _/ [! L4 Q
with CPP. The gonadotropin levels in this disorder
( }/ `3 } K4 k% `/ }9 t( @' Qare suppressed to prepubertal levels and do not show
9 [* L1 A& K1 hpubertal response of gonadotropin after gonadotropin-
% t; c# |- x. Rreleasing hormone stimulation. This is a sex-linked
+ c. o+ r# m, ^9 ^3 cautosomal dominant disorder that affects only
: u1 e8 v! [- n( amales; therefore, other male members of the family
* s7 j, m8 T3 g" bmay have similar precocious puberty.3' b- M; m, v$ F* F- v3 q
In our patient, physical examination was incon-2 i) g' J% ~ j& S5 J/ J8 p {
sistent with true precocious puberty since his testi-, L% A# y& F9 \0 E$ F
cles were prepubertal in size. However, testotoxicosis4 c+ L2 M1 [ _% R! c2 Q) m0 `
was in the differential diagnosis because his father' I& Q) B* H$ Q
started puberty somewhat early, and occasionally,
4 R2 i# ~ @+ {1 q% Ftesticular enlargement is not that evident in the
. w5 d5 m% C5 [# |5 D1 B+ b6 {beginning of this process.1 In the absence of a neg-1 x" `7 G+ m3 j2 A7 O5 e6 s$ }8 w0 T
ative initial history of androgen exposure, our; {* o8 }4 I. W
biggest concern was virilizing adrenal hyperplasia,0 M+ c9 F0 D7 t* O* N
either 21-hydroxylase deficiency or 11-β hydroxylase5 ^# x2 p" s7 N$ L$ z0 I. G: W
deficiency. Those diagnoses were excluded by find-" p3 f2 I- G" X1 p" J3 s. c
ing the normal level of adrenal steroids.
5 ?+ z5 n' z, h2 }The diagnosis of exogenous androgens was strongly" w P+ w' ^/ K$ Q
suspected in a follow-up visit after 4 months because
: R; ? J6 d/ p; j" ?the physical examination revealed the complete disap-7 E& C8 a1 r e2 N; Z" s: t) p
pearance of pubic hair, normal growth velocity, and
' }$ M" ~, O+ h& jdecreased erections. The father admitted using a testos-4 A. ]6 N; \5 l4 V8 z
terone gel, which he concealed at first visit. He was
$ [* P1 e" u( e2 ~2 nusing it rather frequently, twice a day. The Physicians’
9 J; U* l% j" XDesk Reference, or package insert of this product, gel or
3 f1 \; E1 q) F8 l5 W5 lcream, cautions about dermal testosterone transfer to
+ r ?0 n# J4 K, }: l9 M7 `( eunprotected females through direct skin exposure.
2 p) S; s/ K5 L$ \. `, B7 uSerum testosterone level was found to be 2 times the
+ w* C# \# S$ g$ o& jbaseline value in those females who were exposed to
' Q7 S) }& C9 _$ zeven 15 minutes of direct skin contact with their male
+ ?) J8 @' ^( }) v( f8 Mpartners.6 However, when a shirt covered the applica-
4 E- F i( m3 |$ ction site, this testosterone transfer was prevented.0 p5 N$ X8 d; x6 r. f! M
Our patient’s testosterone level was 60 ng/mL,
% C% d8 b, L+ D/ uwhich was clearly high. Some studies suggest that1 b6 `4 V7 y+ e* P G. i5 D
dermal conversion of testosterone to dihydrotestos-7 C, w& u( W* D3 X# n6 i# \
terone, which is a more potent metabolite, is more
2 E8 o j4 ^5 \5 e% Z) sactive in young children exposed to testosterone0 p1 A0 j! F+ y' y2 J! ^6 i
exogenously7; however, we did not measure a dihy-
6 ^$ x, n3 ~+ M6 S* s) s) ^' ddrotestosterone level in our patient. In addition to
% ?" f0 s/ V+ ]* w2 }# Bvirilization, exposure to exogenous testosterone in
4 z1 I7 S! e ]/ P) l( ^children results in an increase in growth velocity and- O6 V+ F9 ]4 T) ~
advanced bone age, as seen in our patient.
8 L, v4 B" o; lThe long-term effect of androgen exposure during. r5 g0 a6 F% I1 v
early childhood on pubertal development and final% ] b- V$ l& [
adult height are not fully known and always remain
; I' J& A" N. c) ^/ J6 X) Ya concern. Children treated with short-term testos-% k- x# n. w& d7 b n% g1 Q
terone injection or topical androgen may exhibit some
3 y% s6 d# h8 ^! {acceleration of the skeletal maturation; however, after2 _/ N' h9 q* B$ b6 ?- s
cessation of treatment, the rate of bone maturation
& y; O+ w; x" H! s" S) Ddecelerates and gradually returns to normal.8,9
6 S" y Q& b5 h! l2 _9 t9 w9 S0 ~There are conflicting reports and controversy9 C% {. f5 q. |7 } ~( i- o
over the effect of early androgen exposure on adult H# n" J3 {: n
penile length.10,11 Some reports suggest subnormal3 m f' d+ |" C6 Z
adult penile length, apparently because of downreg-
# `0 [2 |1 J. Q0 q6 ~9 M6 X+ q0 Oulation of androgen receptor number.10,12 However,: I2 z* M+ [, i* @: f! k Q/ _
Sutherland et al13 did not find a correlation between
' V4 Z$ I H+ \. q* mchildhood testosterone exposure and reduced adult
( k( O- p' r( _' Lpenile length in clinical studies.
2 t( E0 w% R( a O6 E2 h8 w* ]Nonetheless, we do not believe our patient is# d9 b! v/ {0 `( I, s. {6 z% R
going to experience any of the untoward effects from
4 p! Y7 h" N2 F8 xtestosterone exposure as mentioned earlier because
/ R. q" ] l+ o3 ?. Othe exposure was not for a prolonged period of time.
! C/ A5 p5 f) U" {& q& [- zAlthough the bone age was advanced at the time of
$ E0 C, L/ Y3 X4 L$ K. d8 ediagnosis, the child had a normal growth velocity at
5 l7 d Z% o% F5 P8 Hthe follow-up visit. It is hoped that his final adult% b$ [# H8 A4 A
height will not be affected.
: |6 q$ ^- x! u( ]$ O. s. dAlthough rarely reported, the widespread avail-
; C& `1 Y8 i C9 Wability of androgen products in our society may
B' z1 l/ ?4 U3 v, ~( mindeed cause more virilization in male or female
8 `* `2 t5 ~' k) G0 U8 pchildren than one would realize. Exposure to andro-
5 Q$ [! A p6 O& B+ j0 fgen products must be considered and specific ques-
1 `4 ~% [4 M+ p6 X% k! D2 B7 Etioning about the use of a testosterone product or
7 d4 R% g& B1 \$ n" R# `gel should be asked of the family members during9 G3 G; \ R2 w9 O
the evaluation of any children who present with vir-$ p2 Z2 u4 j! r) R- A& \ m r
ilization or peripheral precocious puberty. The diag-% A6 `' P* j1 a0 g
nosis can be established by just a few tests and by
8 j8 o# ?. q3 d- U, A+ ]appropriate history. The inability to obtain such a1 T% [/ c! E! `9 `# _' d
history, or failure to ask the specific questions, may
2 s- z Q" R0 b; O* a6 {2 presult in extensive, unnecessary, and expensive
0 S# P/ v' w& i& r' y$ d* einvestigation. The primary care physician should be6 B; j6 E, }5 L: M3 {( S
aware of this fact, because most of these children
# Y! } y, p cmay initially present in their practice. The Physicians’
' l3 f, |) x1 \9 E, J/ cDesk Reference and package insert should also put a
5 t" M7 N1 i2 Z; k1 q1 Owarning about the virilizing effect on a male or2 U" c# j$ u: F, W6 p2 Q
female child who might come in contact with some-6 `/ t4 u: q2 v+ n0 c( c
one using any of these products.6 A6 } x( u* R# T& p
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: P' [4 v. e7 M7 X6 o7. Klugo RC, Cerny JC. Response of micropenis to topical
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$ c5 H, q6 R5 D6 p8. Guthrie RD, Smith DW, Graham CB. Testosterone W3 E7 W5 n" a( l
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