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is a significant concern for physicians. Central
# I7 c1 k3 M/ E. ^3 b6 _$ \4 bprecocious puberty (CPP), which is mediated2 m2 W9 k: b4 t) N2 b$ c
through the hypothalamic pituitary gonadal axis, has' z5 I8 J- i C+ M7 _
a higher incidence of organic central nervous system
3 q* j, C- M$ t: d( r& vlesions in boys.1,2 Virilization in boys, as manifested
9 ^9 R" Q0 {* {, }by enlargement of the penis, development of pubic
$ P2 t1 L. M0 C# J& F3 @2 L% A1 h: T: |; dhair, and facial acne without enlargement of testi-5 D, P7 l7 Z& X6 D/ F. t2 r
cles, suggests peripheral or pseudopuberty.1-3 We
/ O/ v1 `( }9 g* A6 a* b4 lreport a 16-month-old boy who presented with the! U: x0 K: M/ M/ _* a& o
enlargement of the phallus and pubic hair develop-& |" v/ S" G( R) q' |3 B* ~2 I* w, q0 K: ?! `
ment without testicular enlargement, which was due3 Q8 }3 o d$ g# g5 j' l
to the unintentional exposure to androgen gel used by
0 P9 d& H1 l* z/ nthe father. The family initially concealed this infor-; N) k1 u( j3 t* j/ [& \& X
mation, resulting in an extensive work-up for this
+ c8 m+ X' p4 p; m& c; bchild. Given the widespread and easy availability of# ^: ~. C. J& w: j' ~; C) n; ~
testosterone gel and cream, we believe this is proba-1 n* e' ?, m, A6 ^6 |2 w8 K
bly more common than the rare case report in the
( q+ x' a7 S3 V8 x3 J; L7 uliterature.4* h5 B- ^3 {4 i& {3 ^+ E, ~
Patient Report
5 L7 ?' I K T3 [! [8 n. PA 16-month-old white child was referred to the$ W+ E+ p3 R; ~" V7 o) e
endocrine clinic by his pediatrician with the concern; @* D2 r) v- V5 k1 Y
of early sexual development. His mother noticed5 T L8 v+ c# y% R+ s+ W
light colored pubic hair development when he was8 [5 @1 _8 V% X7 ~7 a# h9 B
From the 1Division of Pediatric Endocrinology, 2University of \2 ?+ p2 @% \: @2 f
South Alabama Medical Center, Mobile, Alabama.
" S z. w4 J! L2 E6 a! }" }Address correspondence to: Samar K. Bhowmick, MD, FACE,
6 N7 R5 m% @5 i, m* t6 w$ f" q8 @Professor of Pediatrics, University of South Alabama, College of: h9 J) }- D9 B0 Z
Medicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;3 F9 Y' ^$ n! a5 j
e-mail: [email protected].
4 R" c4 r, w- n4 b# @' habout 6 to 7 months old, which progressively became7 [3 d- _8 k* b7 v% T
darker. She was also concerned about the enlarge-
" y" C* a1 ^# @ment of his penis and frequent erections. The child# Y# h- w+ b, |- g. l( L
was the product of a full-term normal delivery, with0 w! d6 K9 R; ~' P* x# {* H
a birth weight of 7 lb 14 oz, and birth length of8 B: k, J2 X/ ]9 `7 X- h
20 inches. He was breast-fed throughout the first year0 d+ p2 s: \1 z
of life and was still receiving breast milk along with* S" I0 N, F9 F2 \ b5 Q' j
solid food. He had no hospitalizations or surgery,: }/ {2 ]" E+ ?2 s
and his psychosocial and psychomotor development
0 _! A, i3 v2 ]& Y, K) o1 Q+ uwas age appropriate.
; r, v2 {: [. S( c0 D! x1 dThe family history was remarkable for the father,7 x3 |4 ?; `. j* ?7 Y& w+ O
who was diagnosed with hypothyroidism at age 16,
& g; n1 E, @! ewhich was treated with thyroxine. The father’s
! X. C2 {4 Y+ R3 Theight was 6 feet, and he went through a somewhat
, R) ?* w$ j) O+ _9 s7 Aearly puberty and had stopped growing by age 14.
5 D9 U! x Y, X H1 |) YThe father denied taking any other medication. The
0 w# M- { \6 D* u Xchild’s mother was in good health. Her menarche
4 j [# ^0 m* _0 @6 Xwas at 11 years of age, and her height was at 5 feet
! d3 j3 u0 U3 c5 inches. There was no other family history of pre-9 l: q1 y" @$ t5 k+ w' c0 e& d3 |$ }
cocious sexual development in the first-degree rela-4 `5 L# P: ]- r; P' g- s, m" ]
tives. There were no siblings.+ ~2 I- ]: I/ U, x
Physical Examination- W3 M7 H+ G. C* x
The physical examination revealed a very active,
, L7 u# _$ Y. F/ ?playful, and healthy boy. The vital signs documented
) s0 d+ V. n* Y# E: R4 T+ Z5 Ka blood pressure of 85/50 mm Hg, his length was' R. T. i) e- d7 [' M
90 cm (>97th percentile), and his weight was 14.4 kg) F, |+ Z' ]5 s+ X* k0 x& E% p
(also >97th percentile). The observed yearly growth
& t9 t: M9 s" \4 M. C1 v) Qvelocity was 30 cm (12 inches). The examination of
U3 s \: V9 _ P4 j6 ]the neck revealed no thyroid enlargement.1 D1 y( Q$ ^9 V" n. W
The genitourinary examination was remarkable for, \; x, {$ }# E
enlargement of the penis, with a stretched length of/ w. i6 H6 j8 F9 u
8 cm and a width of 2 cm. The glans penis was very well
4 V- n; W H1 C8 j9 a6 I, R: y- L& b: ?developed. The pubic hair was Tanner II, mostly around5 w' o4 Q- `$ I5 Z3 f9 j
540
. B+ J- L7 v9 [; }7 }6 {2 U4 @9 qat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
: h# k) L" G9 G3 sthe base of the phallus and was dark and curled. The* |9 D. Z& f: u6 ?; J/ g
testicular volume was prepubertal at 2 mL each./ \; Y8 s) k9 M$ u( E, T" z$ B$ v) r8 Z
The skin was moist and smooth and somewhat
8 t3 P; F% {/ N- S% T' L: ooily. No axillary hair was noted. There were no9 ?1 g r) i, q K
abnormal skin pigmentations or café-au-lait spots.
8 d1 q; \- b. tNeurologic evaluation showed deep tendon reflex 2+( F& B4 R7 f1 L' |& W8 w! V
bilateral and symmetrical. There was no suggestion
C5 ~& o% {: Z { qof papilledema.
9 f) |) z, f1 ALaboratory Evaluation
6 n3 @1 f# |8 c7 i; o& c7 B, \- wThe bone age was consistent with 28 months by* i+ U0 j! y7 Q0 h
using the standard of Greulich and Pyle at a chrono-/ F* B% g+ X) @) I
logic age of 16 months (advanced).5 Chromosomal6 ^' V, M0 l0 M) P/ Q
karyotype was 46XY. The thyroid function test
# ]2 J3 E: K- S; d4 Rshowed a free T4 of 1.69 ng/dL, and thyroid stimu-
1 _5 r' d8 w; M: Ulating hormone level was 1.3 µIU/mL (both normal).
0 e- _) N% q9 n1 z( b& Q3 OThe concentrations of serum electrolytes, blood# Z' F& c# }% [ j* N3 i$ v
urea nitrogen, creatinine, and calcium all were* B0 \" l. H, `7 j2 a3 J' `3 c
within normal range for his age. The concentration
: ^, T% ^- R" [! Y1 C! |7 h, Tof serum 17-hydroxyprogesterone was 16 ng/dL
g l; b' u3 Z2 M T: H8 t(normal, 3 to 90 ng/dL), androstenedione was 20, g" { p# N- e$ _. `0 H
ng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-
3 W5 N% U$ W! R# ? @+ D) Kterone was 38 ng/dL (normal, 50 to 760 ng/dL),
5 ~& z9 y+ q" r+ V! _1 Xdesoxycorticosterone was 4.3 ng/dL (normal, 7 to$ N! ]' f! ]' r6 z+ c8 j5 n3 K4 q0 g5 i
49ng/dL), 11-desoxycortisol (specific compound S)
' z% o" t C5 }" U7 Ewas 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-% \8 L- {3 d* t& y s) J
tisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total( }# o r- k/ p1 S' Z9 K6 w) V
testosterone was 60 ng/dL (normal <3 to 10 ng/dL),
8 j+ T* ?; L" ?: h5 K! n% J1 U5 I E9 pand β-human chorionic gonadotropin was less than
, S6 J; n% Y1 F# U; g& C! E$ k) r5 mIU/mL (normal <5 mIU/mL). Serum follicular! q$ \+ U% q5 }1 s
stimulating hormone and leuteinizing hormone& q3 h# j; g0 X
concentrations were less than 0.05 mIU/mL
. z& C) R1 e. H6 ` ](prepubertal)." t1 D5 ?, J. L5 N0 _9 f h7 R
The parents were notified about the laboratory
/ o% ?; g& Z7 o" Qresults and were informed that all of the tests were
. V8 x6 S# G. h+ n: i( rnormal except the testosterone level was high. The ?. T& ^: L3 P) H6 x" G% k9 e5 s
follow-up visit was arranged within a few weeks to
$ j% v- ]8 p7 \4 @3 eobtain testicular and abdominal sonograms; how-
( r. C+ C" A5 l% {) k/ \- zever, the family did not return for 4 months.
0 K2 _, a3 t( T8 L! ~0 UPhysical examination at this time revealed that the7 z! }& N; o+ o- {2 z1 }5 n; z0 Y8 A
child had grown 2.5 cm in 4 months and had gained
/ `. s3 c% w4 N" Z9 L& X( O2 kg of weight. Physical examination remained
! R3 @/ v5 R: Y+ _; eunchanged. Surprisingly, the pubic hair almost com-
- f# J; v9 X6 k- @pletely disappeared except for a few vellous hairs at! h4 S* p# ~$ q* v5 c! Q) C
the base of the phallus. Testicular volume was still 2, U( D4 w/ f0 @: U( {4 l
mL, and the size of the penis remained unchanged.0 j9 L9 B/ h C( S( r
The mother also said that the boy was no longer hav-# B9 g7 S- g+ c- y2 h! ]
ing frequent erections.' ^0 O; K. M+ x! O; K9 Q6 _, a
Both parents were again questioned about use of
9 c: [3 Y$ z/ v2 }/ g, [% }5 y% Uany ointment/creams that they may have applied to
' m" Z- v* a8 Xthe child’s skin. This time the father admitted the
$ y; q1 L4 g% y! y B' S6 h7 OTopical Testosterone Exposure / Bhowmick et al 541; F9 j6 Y/ y; U+ j7 O# [* w( I2 B: b
use of testosterone gel twice daily that he was apply-% y2 L# P& n* E! e- t" d" ?6 ^8 d
ing over his own shoulders, chest, and back area for) U9 @ m; U$ X; p. ]
a year. The father also revealed he was embarrassed
) H S% @: C0 q% p1 h, cto disclose that he was using a testosterone gel pre-
. O" X( C# D+ y# X& `- ~scribed by his family physician for decreased libido
z/ P/ g) T7 R, f: Isecondary to depression.7 V8 k& W6 m7 ~) P! m2 f
The child slept in the same bed with parents.6 p! s# G* ]1 A7 @6 R, M; i
The father would hug the baby and hold him on his7 }! B$ x0 T; b2 t- A) y" f
chest for a considerable period of time, causing sig-$ {$ Z2 N8 ^6 \ e& y% T: C3 `: Z
nificant bare skin contact between baby and father.
- f# J: Z) L* ~: UThe father also admitted that after the phone call,
5 z0 d2 U6 m4 H- gwhen he learned the testosterone level in the baby
" `1 D& F4 E5 J5 B4 Xwas high, he then read the product information
% Y$ K) m# F8 A1 d* s& D6 R8 _7 ypacket and concluded that it was most likely the rea-
7 L2 ~6 _) h6 \% L7 j: x. @" Bson for the child’s virilization. At that time, they
% l( e, u6 g# M& |% ldecided to put the baby in a separate bed, and the$ B* i( z! Z2 a, s+ {! @" Z- z
father was not hugging him with bare skin and had$ D8 B7 L( ~3 B2 N
been using protective clothing. A repeat testosterone
3 ~/ }0 b- H3 C" Y* F" itest was ordered, but the family did not go to the6 m* w/ j0 v7 p- s
laboratory to obtain the test.
0 [3 U9 M, f. f9 `/ f( HDiscussion5 q# I# t: r, Z8 ]% S1 E
Precocious puberty in boys is defined as secondary2 L' a4 z- X" U; V+ b
sexual development before 9 years of age.1,4
# u+ {! Q6 n! N0 I+ W( U/ T$ rPrecocious puberty is termed as central (true) when* p* c% M S2 G( n: q8 v
it is caused by the premature activation of hypo-
, p- R# T' l% I0 E/ r+ X3 sthalamic pituitary gonadal axis. CPP is more com-4 z; v0 j' F, v+ P( m
mon in girls than in boys.1,3 Most boys with CPP% |/ p& i8 j2 a
may have a central nervous system lesion that is
3 K; r7 U( ]" n2 K8 `& K5 ?* m3 @responsible for the early activation of the hypothal-
( A4 Q5 M& m- @7 }$ lamic pituitary gonadal axis.1-3 Thus, greater empha-
7 C1 s4 x9 X/ x* O7 hsis has been given to neuroradiologic imaging in4 ~* z& u; a* L$ G8 u. r1 {
boys with precocious puberty. In addition to viril-
% y: G' t( f1 c9 `" Xization, the clinical hallmark of CPP is the symmet-
8 j* ?, g; b; lrical testicular growth secondary to stimulation by
8 X- {7 | ^; ]5 ]gonadotropins.1,3
0 y3 m9 O0 ^/ x+ u4 E3 s- c" Z7 _Gonadotropin-independent peripheral preco-. a9 H% c k7 F3 F# h2 b
cious puberty in boys also results from inappropriate2 h+ \9 U$ M7 {' ~& W
androgenic stimulation from either endogenous or
1 N# A% q7 A% k1 A! wexogenous sources, nonpituitary gonadotropin stim- n/ W4 H) b: B, T. Y, j& V$ F5 _
ulation, and rare activating mutations.3 Virilizing
" l% }+ N$ Y }0 ~ `! Hcongenital adrenal hyperplasia producing excessive
1 P; C; d/ v" Q+ T# o' m+ A' ]adrenal androgens is a common cause of precocious
$ v. C* _9 V# w x0 V ^puberty in boys.3,4
6 M5 n$ E% A, a1 ^5 I5 y8 R- j9 PThe most common form of congenital adrenal7 `8 K# T' ]( l' z. L g# u, e8 z; @% G
hyperplasia is the 21-hydroxylase enzyme deficiency.
9 @+ X0 `: i/ K' X. f1 hThe 11-β hydroxylase deficiency may also result in
) U. P$ F( W6 _' x0 _excessive adrenal androgen production, and rarely,
" g& O3 n8 Y- R( Uan adrenal tumor may also cause adrenal androgen6 b, K- P# y3 ]1 q) g9 z- H
excess.1,3" V( R8 w. v" S& B* H! f' A
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
% W7 M: l( X; O4 N542 Clinical Pediatrics / Vol. 46, No. 6, July 2007
1 c" O A% }# K0 @4 TA unique entity of male-limited gonadotropin-
\- I$ J7 A0 U+ z7 w C, gindependent precocious puberty, which is also known
* l- R2 e* s9 l- Nas testotoxicosis, may cause precocious puberty at a
, |$ |+ i- C* r! kvery young age. The physical findings in these boys6 `, s: t1 a- e4 J+ o& Y/ n5 |
with this disorder are full pubertal development,8 |$ A8 f, W/ {6 F \- h( X
including bilateral testicular growth, similar to boys
9 j5 G% I/ `( j( x) y) twith CPP. The gonadotropin levels in this disorder4 T) w2 ^: p0 c5 G2 w/ F
are suppressed to prepubertal levels and do not show
$ X$ y* C5 k7 V2 {+ j4 U% `pubertal response of gonadotropin after gonadotropin-5 C: d9 ^+ e2 S! F' d5 K! r
releasing hormone stimulation. This is a sex-linked
$ h. q; N+ t6 U4 D, Mautosomal dominant disorder that affects only2 p* u [$ k+ l7 a u( \( ]
males; therefore, other male members of the family, y2 t; Y9 t' r- \! A' q& U/ i
may have similar precocious puberty.3( {! Z# j5 c$ z% Y0 |: H# d' O
In our patient, physical examination was incon-
2 V, g, I- z" b. g) `2 J1 Isistent with true precocious puberty since his testi-3 b1 r% c$ @$ c2 [
cles were prepubertal in size. However, testotoxicosis
2 z- B( t7 `2 I9 d- h6 Uwas in the differential diagnosis because his father
7 v0 v7 A7 z9 L$ Cstarted puberty somewhat early, and occasionally,
$ ?8 @, f1 k2 o; {testicular enlargement is not that evident in the* @# v0 F" b" `3 k8 b: H! W1 L+ ^/ q. N
beginning of this process.1 In the absence of a neg-
& Z# N8 b. C' s' r; h) e+ n4 @ative initial history of androgen exposure, our) ~$ ^4 s7 ~, M5 |
biggest concern was virilizing adrenal hyperplasia,: c$ }& X7 m: |$ A: t
either 21-hydroxylase deficiency or 11-β hydroxylase: x2 P; c4 Y0 P. n
deficiency. Those diagnoses were excluded by find-, x3 y7 b2 S! i2 X* K* a n
ing the normal level of adrenal steroids., T& a" \# g( V" \
The diagnosis of exogenous androgens was strongly
5 q) y5 j2 {/ e1 C- v! m/ T/ @suspected in a follow-up visit after 4 months because1 `/ Y( _- [& i
the physical examination revealed the complete disap-% R( l/ j( z* \; S' \0 [; o
pearance of pubic hair, normal growth velocity, and: V1 `4 Y [! s+ Y6 C1 a) H" c
decreased erections. The father admitted using a testos- y' B" @: W: [6 a; [, z* l
terone gel, which he concealed at first visit. He was
; e h/ {- f8 t# \6 _using it rather frequently, twice a day. The Physicians’1 B) x" o( `; `8 X+ y1 q
Desk Reference, or package insert of this product, gel or
' p! i7 l+ D) X, q9 _cream, cautions about dermal testosterone transfer to! k: y+ x' ?( b: s5 f# g" Z% Z
unprotected females through direct skin exposure.+ I4 |7 U* H4 N% A: D) M% S
Serum testosterone level was found to be 2 times the
1 d9 S$ Q1 b# ^baseline value in those females who were exposed to
0 D' W; z( ^( o8 weven 15 minutes of direct skin contact with their male* J% W5 q% C& |' `9 b
partners.6 However, when a shirt covered the applica-- E5 c- b) Q- K2 S) k% V
tion site, this testosterone transfer was prevented.( [6 e+ S! q: @" \# |7 W& w
Our patient’s testosterone level was 60 ng/mL,* Q+ Q6 }1 u$ l
which was clearly high. Some studies suggest that
' i. p, s' l; V; ~" q% R8 Cdermal conversion of testosterone to dihydrotestos-/ Q$ R( b2 J4 O4 H7 u" N
terone, which is a more potent metabolite, is more
+ r9 U1 K% l4 x zactive in young children exposed to testosterone
" G3 b8 |5 i+ Y) M% \- v: ]exogenously7; however, we did not measure a dihy-
0 }! g1 \& C, K: |drotestosterone level in our patient. In addition to9 v& B* K5 b. e
virilization, exposure to exogenous testosterone in/ b; e8 a6 r( D4 k
children results in an increase in growth velocity and
- B3 P% e& l( |advanced bone age, as seen in our patient.$ m* p: O3 m! O& h. U- [& V2 X5 M
The long-term effect of androgen exposure during
9 \9 z) R5 l3 D( ~early childhood on pubertal development and final
; E- C {) C4 P5 Z eadult height are not fully known and always remain; T* K: P3 U2 K+ l' C) `
a concern. Children treated with short-term testos-
/ k. U, w1 r/ o W; r+ Kterone injection or topical androgen may exhibit some
/ D( j4 F: c# s' R4 ~acceleration of the skeletal maturation; however, after4 X8 i( \* X% E9 v% n: D
cessation of treatment, the rate of bone maturation
9 V; @2 ~' n, U+ r' f; \decelerates and gradually returns to normal.8,9
5 Q4 ^9 K% o) G6 L: Y- ?! bThere are conflicting reports and controversy N5 r0 ^1 a8 n! A G
over the effect of early androgen exposure on adult& C2 H0 p" H+ F" o
penile length.10,11 Some reports suggest subnormal1 s5 d+ F; z' C3 c/ z9 T
adult penile length, apparently because of downreg-; d( F! u; q2 R% z
ulation of androgen receptor number.10,12 However,
' V- _2 d( B( P4 `Sutherland et al13 did not find a correlation between
% f+ v! j- ^: s$ S/ H. ~) ochildhood testosterone exposure and reduced adult
& n! s. S8 }% ~" }penile length in clinical studies., O S/ X0 m8 `# {6 G: q
Nonetheless, we do not believe our patient is3 A4 @ {0 D" ]; E% }7 i
going to experience any of the untoward effects from
- e7 K2 v* p! |; `testosterone exposure as mentioned earlier because
( ~8 F4 ~6 T# m7 \& s8 O4 ^, j7 _the exposure was not for a prolonged period of time.
. v9 h, o# D( L% vAlthough the bone age was advanced at the time of, R- ~7 B* | x/ f( f
diagnosis, the child had a normal growth velocity at1 O" |2 U( B0 x7 a% w
the follow-up visit. It is hoped that his final adult. z6 v0 U2 I D. k/ t# C0 {- ]7 V
height will not be affected.
$ u/ C7 k3 e2 C' X' r! [ U: lAlthough rarely reported, the widespread avail-
, W/ b$ }* r, q# zability of androgen products in our society may
! f/ l+ K/ u6 ]# [7 N. o( p( Uindeed cause more virilization in male or female
% A" @9 j; y o7 x: x* m. q' Q8 rchildren than one would realize. Exposure to andro-. P$ X5 T# t Z+ x- E
gen products must be considered and specific ques-# o: |/ c( {8 p2 Z1 L5 _7 @4 c1 ?
tioning about the use of a testosterone product or4 m4 N# W6 Y( z0 n" Y
gel should be asked of the family members during. f* l6 i6 f$ c" a0 E
the evaluation of any children who present with vir-
! P: u1 Z% C, X A d& Oilization or peripheral precocious puberty. The diag-
# }& H& b2 X9 _# enosis can be established by just a few tests and by
4 B3 @" X [ e2 xappropriate history. The inability to obtain such a
, g, G. n0 \$ e% N6 \- Zhistory, or failure to ask the specific questions, may
5 t# C# e. e bresult in extensive, unnecessary, and expensive) @( }/ ]; O1 |" _9 w- j( |
investigation. The primary care physician should be
6 [2 ?" N( T* s' P+ vaware of this fact, because most of these children% k& w4 O6 z/ j2 T
may initially present in their practice. The Physicians’5 S0 M6 O" g2 w' |9 z/ g! v, f
Desk Reference and package insert should also put a
: b4 k& f1 \3 g4 B: R) }" uwarning about the virilizing effect on a male or: r6 V$ B+ E* O. r
female child who might come in contact with some-
# F- u" |1 z" z/ g; o z+ _' Z8 r7 r3 pone using any of these products.0 n. `0 H& Q8 }: G# C
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